def on_connect(client, userdata, flags, rc, properties=None):
        """
        Connection callback function
        
        Important parameters:
            rc: ReasonCode object - automatically passed by the paho-mqtt library
                Reason Code indicating the connection result
        """
      
        # ============ Core Usage of Reason Code ============
        
        # 1. Check the type of the ReasonCode object
        print(f"\\n1️⃣  ReasonCode object type: {type(rc).__name__}")
        
        # 2. Obtain the value of the Reason Code
        rc_value = rc.value if hasattr(rc, 'value') else int(rc)
        print(f"2️⃣  Reason Code value: {rc_value}")
        
        # 3. Obtain the name of the Reason Code
        rc_name = rc.getName() if hasattr(rc, 'getName') else str(rc)
        print(f"3️⃣  Reason Code name: {rc_name}")
        
        // Example output
        ⏳ Connecting to the MQTT server...
        
        1️⃣  ReasonCode object type: ReasonCode
        2️⃣  Reason Code value: 134
        3️⃣  Reason Code name: Bad user name or password